Maine’s Platner faces test as four US states hold midterm primary votes

Four states are set to hold their primary votes, further solidifying the battle lines for the United States midterm elections in November.

On Tuesday, citizens in Maine, South Carolina, North Dakota and Nevada are set to cast their ballots in party primaries, designed to select which Democratic and Republican candidates advance to the final round of voting.

But Maine has emerged as one of the most heated primary battlegrounds. With Democrats desperate to flip four seats in the US Senate, all eyes are on Republican Senator Susan Collins’s re-election campaign.

Democrats are hoping to defeat her in November, but the party has fractured over controversies related to its leading candidate, Graham Platner. The race has become one of the most closely watched of the primary season.

At stake in November is control of Congress, and each party is angling to put forward the strongest contender.

Currently, the Republican Party holds slender majorities in both the Senate and the House of Representatives, but Democrats hope to wrest back control, in what would represent a major rebuke to President Donald Trump.

State-level races are also in play during Tuesday’s primaries. Several in key swing states like Nevada could have outsized influence over election administration in the years ahead.

The Democratic Party’s long-shot hope of retaking the Senate hinges on Maine, a lushly forested northeastern state largely bordered by Canada and the Atlantic Ocean.